Bug 237533 depends on 20 bugs:

•    237533: iOS/iPad 15.3.1 slow drawElements with TRIANGLE_FAN mode [NEW; assigned to webkit-unassigned]
  •    231180: ANGLE Metal backend regressions metabug [NEW; assigned to webkit-unassigned]
    •    231108: REGRESSION (iOS 15): Certain shaders do not render correctly on older devices [NEW; assigned to webkit-unassigned]
    •    231658: Regression: ANGLE Metal fails to render celestrak.com on A9 class hardware [NEW; assigned to webkit-unassigned]
    •    232122: REGRESSION (iOS 15): Canvas resizing causes webpage to jetsam [NEW; assigned to webkit-unassigned]
    •    232271: REGRESSION (iOS 15): Fragment shader performance is several times worse [NEW; assigned to webkit-unassigned]
    •    234006: ANGLE Metal stencil, depth, multisample performance regression [NEW; assigned to webkit-unassigned]
    •    234926: Dynamic indexing into a fixed-size uniform array with GLSL makes the Safari tab hang [NEW; assigned to webkit-unassigned]
    •    235478: WebGL enabling Blend causes high performance drop [NEW; assigned to webkit-unassigned]
    •    236130: Low fps when mesh instances are scaled to 0 [NEW; assigned to webkit-unassigned]
    •    237434: Precision issue in in Vertex Shader on iPads/M1 (but work on Intel Mac) [NEW; assigned to webkit-unassigned]
    •    237598: 1.0.x/conformance/rendering/texture-switch-performance.html fails on AMD dgpu Metal [NEW; assigned to webkit-unassigned]
    •    239518: ANGLE_instanced_arrays has poor performance, Intel [NEW; assigned to webkit-unassigned]
    •    230749: REGRESSION (Safari 15): Poor WebGL performance on https://downloads.scirra.com/labs/particles [RESOLVED FIXED; assigned to kkinnunen]
    •    231475: REGRESSION (iOS 15), safari604.1: Could not link the shader program [RESOLVED FIXED; assigned to kpiddington]
    •    231607: REGRESSION (iOS 15): Tab crashes when trying to render Projector stories [RESOLVED FIXED; assigned to kkinnunen]
    •    232559: ANGLE Metal perf regression: krpano.com viewer [RESOLVED WORKSFORME; assigned to webkit-unassigned]
    •    234008: ANGLE Metal framebuffer object clear performance regression [RESOLVED FIXED; assigned to djg]
    •    239688: REGRESSION (iOS 15.4): ColorizePhoto.com doesn't work [RESOLVED WONTFIX; assigned to webkit-unassigned]
    •    242297: Shader fails to link due to Metal internal error [RESOLVED CONFIGURATION CHANGED; assigned to webkit-unassigned]
      •    237658: [GODOT] Internal error compiling shader with Metal backend. [RESOLVED CONFIGURATION CHANGED; assigned to webkit-unassigned]

Bug 237533 does not block any bugs.